How can I say this in a nice way?

Okay we me & my boyfriend just broke up, I used to have his family and friends on Facebook but then I deleted them, but his mates fiancé added me again, & I don't want to approve her as she probably just wants to be nosey, so how can I tell her by message that there's no point of her being on my profile, as when I write things I always sound horrible even though I'm not.